Defensive publication



DEFENSIVE PUBLICATION UNITED STATES PATENT OFFICE Published at the request of the applicant or owner in accordance with the Notice of Dec. 16. 1969, 869 0.Gl 687. The abstracts of Defensive Publication applications are identified by distinctly numbered series and are arranged chronologically. The heading of each abstract indicates the number of pages of specification. including claims and sheets oi drawings contained in the application as originally filed. The files of these applications are available to the public for inspection and reproduction may be purchased for 30 cents a sheet.

Defensive Publication applications have not been examined as to the merits of alleged invention. The Patent Oflice makes no assertion as to the novelty oi the disclosed subject matter.

PUBLISHED DECEMBER 1, 1970 T881,001 COLOR STABILIZATION 0F ISOCYANATE ETHER SOLUTIONS Arthur P. Werts III, 1362 Lafayette Circle, and Sidney B.

Miller, In, 4426 Glenden Road, both of Kingsport,

Tenn. 37664 Filed Apr. 9, 1970, Ser. No. 27,103 Int. Cl. C08f 45/72, 45/58 US. Cl. 252-182 No Drawing. 7 Pages Specification Solutions of isocyanates in solvents containing ether or ether/ester groups to be employed in the manufacture of polyurethane products to be used as industrial coatings are stabilized against undesirable color formation by dissolving in the solvent component a small amount of a phenol such as 2,G-ditertiarybutyl-p-cresol, 2,6-dioctadecyl-p-cresol, toluhydroquinone, and hydroquinone monomethyl ether (p-methoxyphenol). Alternatively, the stabilizer may be added to the solution of the isocyanate in the solvent. Solutions of isocyanates stabilized by the addition of these compounds are found to have excellent keeping properties and may be stored for indefinite periods without color formation. When such solutions are employed in the manufacture of polyurethanes no adverse color is carried into the polyurethane product or the coatings produced therefrom. 

